Genuine OEM Volkswagen Coolant Hose, part number 7P0121157B. This hose is a vital component of the engine cooling system, responsible for carrying hot and cold coolant between various engine components, such as the radiator, engine block, and heater core, to maintain optimal operating temperature. It is positioned within the engine cooling circuit. Made from high-quality, heat-resistant rubber with internal reinforcement, it withstands pressure and temperature extremes. Choosing a genuine OEM hose ensures the correct routing geometry, material composition, and resistance to coolant chemicals for leak-free and reliable performance.